/*!
 * Copyright (c) 2016 by Contributors
 * \file acl_tensor.h
 * \brief
 * \author Joey
 */
#ifndef ACL_TENSOR_H_
#define ACL_TENSOR_H_

#ifdef USE_ACL
#ifdef USE_OPENCL
#include "arm_compute/runtime/CL/CLSubTensor.h"
#include "arm_compute/runtime/CL/CLTensor.h"
#elif defined(USE_OPENGLES)
#include "arm_compute/runtime/GLES_COMPUTE/GCTensor.h"
#endif
#include "arm_compute/runtime/SubTensor.h"
#include "arm_compute/runtime/Tensor.h"

#include <memory>

namespace paddle_mobile {
namespace operators {
namespace acl {
enum class TargetHint {
  DONT_CARE,
  OPENCL,
  OPENGLES,
  NEON,
};

enum class ConvolutionMethodHint {
  GEMM,
  DIRECT,
};
namespace cpp14 {
template <class T>
struct _Unique_if {
  typedef std::unique_ptr<T> _Single_object;
};

template <class T>
struct _Unique_if<T[]> {
  typedef std::unique_ptr<T[]> _Unknown_bound;
};

template <class T, size_t N>
struct _Unique_if<T[N]> {
  typedef void _Known_bound;
};

template <class T, class... Args>
typename _Unique_if<T>::_Single_object make_unique(Args &&... args) {
  return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
}

template <class T>
typename _Unique_if<T>::_Unknown_bound make_unique(size_t n) {
  typedef typename std::remove_extent<T>::type U;
  return std::unique_ptr<T>(new U[n]());
}

template <class T, class... Args>
typename _Unique_if<T>::_Known_bound make_unique(Args &&...);
}  // namespace cpp14

class Tensor {
 public:
  explicit Tensor(arm_compute::TensorInfo &info) noexcept;
  virtual ~Tensor() {}
  Tensor(Tensor &&src) noexcept;
  void set_info(arm_compute::TensorInfo &&info) { _info = info; }
  arm_compute::ITensor *set_target(TargetHint target);
  const arm_compute::TensorInfo &info() const { return _info; }
  arm_compute::ITensor *tensor() { return _tensor.get(); }
  void allocate();
  void init() {}
  TargetHint target() const { return _target; }
  virtual void map(bool blocking = true);
  virtual void unmap();

 private:
  TargetHint _target;
  arm_compute::TensorInfo _info;
  std::unique_ptr<arm_compute::ITensor> _tensor;
};

class SubTensor {
 public:
  SubTensor(Tensor *parent, arm_compute::TensorShape &tensor_shape,
            arm_compute::Coordinates &coords) noexcept;
  ~SubTensor() {}
  arm_compute::ITensor *tensor();
  const arm_compute::ITensor *tensor() const;
  TargetHint target() const;
  void allocate();
  arm_compute::ITensor *set_target(TargetHint target);

 private:
  /** Instantiates a sub-tensor */
  void instantiate_subtensor();

 private:
  /**< Target that this tensor is pinned on */
  TargetHint _target;
  /**< SubTensor shape */
  arm_compute::TensorShape _tensor_shape;
  /**< SubTensor Coordinates */
  arm_compute::Coordinates _coords;
  /**< Parent tensor */
  arm_compute::ITensor *_parent;
  /**< SubTensor */
  std::unique_ptr<arm_compute::ITensor> _subtensor;
};

}  // namespace acl
}  // namespace operators
}  // namespace paddle_mobile
#endif
#endif  // ACL_TENSOR_H_